So many inaccuracies here.Okay, maybe not change in rate of growth, but you are still playing with percentages and making possibly invalid assumptions.
It's somewhat similar to the statement that food causes cancer, because in 100% of the cancer cases, the patient ate food. The researcher forgot to look at the other side of the equation.
Just because the percentage year of year are less, doesn't mean that people have reduced buying EVs. It could mean something as simple as "there wasn't as many used EVs for sale". It also could mean that the EV sales are up, but ICE was up more. And that may be because people were buying new EVs and there were more cheaper ICEs on the market.
And then you even have to question what an EV is in any study. BEV, PHEV, HEV?
All of this started with a question from you, a person who has severe range anxiety.
Nothing is going to be good enough for you. You have already proven that you are not open to stretch your envelope.
The chart I posted comes from the SMMT which as I know you are from the US is described as "The Society of Motor Manufacturers and Traders (SMMT) is the trade association for the United Kingdom motor industry.". It shows and I've mentioned new car sales only, used cars have nothing to do with this so not sure why people keep bringing them up.
As I've also already mentioned. EV includes PHEV vehicles so it's not just pure BEV's. The data is easy to understand, the percentage of EV's being sold to private sellers as a ratio of new car sales has dropped.
Take a look at Carwow that tracks all 0% APR car deals in the UK. What trend do you see around the power trains of those cars?
CarWow 0% APR Deals
I started this post as just an interesting thought that the under floor storage in the boot is rather large to the point that a small range extender engine could probably fit in there. It's a theoretical question as none of us really know the answer but if the world decided to go range extenders, PHEV's would Tesla have to throw their model 3 / Y design out or would they go "Actually we can fit a small engine in the rear so all good".
That then got twisted into me having severe range anxiety because I dared to even mention range extender and Tesla in this forum. I don't have severe range anxiety, I can merely see a place at least currently for PHEV vehicles.